2978888640 has 672 divisors, whose sum is σ = 12173078016. Its totient is φ = 603832320.

The previous prime is 2978888621. The next prime is 2978888657. The reversal of 2978888640 is 468888792.

It is a tau number, because it is divible by the number of its divisors (672).

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 48834210 + ... + 48834270.

Almost surely, 2^2978888640 is an apocalyptic number.

2978888640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2978888640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6086539008).

2978888640 is an abundant number, since it is smaller than the sum of its proper divisors (9194189376).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2978888640 is a wasteful number, since it uses less digits than its factorization.

2978888640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157 (or 134 counting only the distinct ones).

The product of its (nonzero) digits is 12386304, while the sum is 60.

The square root of 2978888640 is about 54579.1960365852. The cubic root of 2978888640 is about 1438.8585089570.

The spelling of 2978888640 in words is "two billion, nine hundred seventy-eight million, eight hundred eighty-eight thousand, six hundred forty".